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INVESTMENTS - TOTAL INVESTMENT GAINS (LOSSES) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Realized investment gains (losses): |  |  |  |
Total realized investment losses | $ (8.6) | $ (21.3) | $ (16.4) | $ (25.1)
Change in allowance for credit losses and write-downs | (3.5) | (1.0) | (13.1) | (10.7)
Change in fair value of equity securities | (1.9) | 4.6 | (3.9) | 2.1
Other changes in fair value | (0.7) | (0.7) | (4.0) | 8.5
Other investment gains (losses) | (6.1) | 2.9 | (21.0) | (0.1)
Total investment losses | (14.7) | (18.4) | (37.4) | (25.2)
Increase (decrease) in equity securities, FV-NI, held at end of period | (0.4) | 4.2 | (4.2) | 4.8
Change in estimated fair value of trading securities | (0.3) | 0.8 | (3.3) | 6.6
Embedded Derivative Related to Fixed Maturity Securities |  |  |  |
Realized investment gains (losses): |  |  |  |
Decrease in fair value of certain fixed maturity investments with embedded derivatives | (0.5) | (0.8) | (3.4) | 7.2
Reinsurance Contract | Coinsurance |  |  |  |
Realized investment gains (losses): |  |  |  |
Decrease in fair value of certain fixed maturity investments with embedded derivatives | (0.2) | 0.1 | (0.6) | 1.3
Total fixed maturities, available for sale |  |  |  |
Realized investment gains (losses): |  |  |  |
Gross realized gains on sales of fixed maturities, available for sale | 22.5 | 1.9 | 74.7 | 2.9
Gross realized losses on sales of fixed maturities, available for sale | (32.9) | (21.8) | (89.2) | (24.6)
Equity securities, net | 1.6 | (0.5) | (0.2) | (0.5)
Other, net | $ 0.2 | $ (0.9) | $ (1.7) | $ (2.9)

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